Coolants - Bosch Rexroth MAD Project Planning Manual

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Application notes
9.8.3

Coolants

Aqueous solution
Emulsion with corrosion protection
Cleaning the coolant circuit
Bosch Rexroth AG R911295781_Edition 11
MAF motors may only be operated via an externally connected cooling sys‐
tem. The motor power loss P
ant. For this reason, MAF motors may only be operated as long as coolant
supply is ensured. The machine manufacturer has to size the cooling system
in such a way that all requirements regarding flow, pressure, cleanliness,
temperature gradient, etc. are complied with in every operating state.
NOTICE
● Observe the manufacturer's instructions when designing and ope‐
rating cooling systems.
● Do not use any cooling lubricants or cutting materials from machining
processes.
All specifications and technical data refer to water as coolant. When using
other coolants, this data is no longer valid and has to be recalculated.
Cooling with running water from the public supply network is not allowed.
Hard water may cause sediments or corrosion and damage both motor and
cooling system. Water which is to be used as cooling water has to comply
with certain criteria and treated accordingly if necessary. For detailed infor‐
mation, please contact your manufacturer of coolant additives.
To ensure corrosion protection and chemical stabilization, an additive which
is suitable for mixed installations with materials according to
"Materials used" on page 202
If the coolants, additives or cooling lubricants used are too aggressive, the
motors may be damaged to an irreparable degree.
⇒Use systems with a closed circuit and a fine filter ≤ 100 µm.
⇒ Observe the environmental protection and waste disposal in‐
structions at the place of installation when selecting the coolant.
Aqueous solutions ensure reliable corrosion protection without significant
changes to the physical properties of the water. The recommended additives
do not contain any substances hazardous to water.
Corrosion protection oils for coolant circuits contain emulsifiers which ensure
a fine distribution of the oil in the water. The oily components of the emulsion
protect the metal surfaces of the coolant ducts against corrosion and cavita‐
tion. An oil content of 0.5 to 2 vol.% has proven its worth.
If, in addition to its function of corrosion protection, the corrosion protection oil
also assumes the function of lubricating the coolant pump, the oil content has
to be approx. 5 vol.%.
● Observe the pump manufacturers' instructions!
Inspect and clean (purge) the cooling system at regular intervals as specified
in the machine and cooling system manufacturer's maintenance schedule.
Note that the utilization of unsuitable cleaning agents may cause irreversible
damage to the motor cooling system. This type of damage does not lie within
the responsibility of Bosch Rexroth.
MAD / MAF Asynchronous Housing Motors
transformed to heat is dissipated via the cool‐
V
Impairment or failure of motor, machine or
cooling system!
has to be admixed to the cooling water.
chapter 9.8.5